Hmm, it looks like there's a bug in the "edit" link -- I've filed a fix and it will go up soon, but until then you can change the word "set" to "sets" in the link shown here (the pencil icon) and it should start working. Sorry!
Yes, it there should be an edit link (with pencil icon) under the "description" tab to do this.
Hi, Andrew -- if this worked for you, could you mark this answer "Accepted"? This is a new feature on the site! Thanks.
Is this a question? Click here to post it to the Questions page.